GTU Chemistry SUMMER-2019 Paper

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Seat No.: ________

Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY BE - SEMESTER–I &II (NEW) EXAMINATION – SUMMER-2019

Subject Code: 2110001 Subject Name: Chemistry Time: 10:30 AM TO 01:00 PM

Date: 03/06/2019 Total Marks: 70

Instructions: 1. Question No.1 is compulsory. Attempt any four out of remaining six questions. 2. Make suitable assumptions wherever necessary. 3. Figures to the right indicate full marks. Mark

Q.1

(a) 1.

Objective Question (MCQ) In propyne there are (a) (b) (c) (d)

2.

Is equal to internal pressure Is equal to external pressure Is greater than internal pressure Is lesser than internal pressure

Corrosion is an example of (a) (b) (c) (d)

(b) 1.

Natural gas Petrol Wood charcoal Coke

The boiling point of a liquid is the temperature at which vapour pressure (a) (b) (c) (d)

7.

Mg Cu Zn Ni

An example of primary fuel is (a) (b) (c) (d)

6.

200-800nm 400-800nm 200-400nm None of these

Galvanizing is the process of coating iron with (a) (b) (c) (d)

5.

Sodium Silicate Sodium hexameta phosphate Sodium metaphosphate Calcium phosphate

The range of UV-visible spectroscopy is (a) (b) (c) (d)

4.

Six sigma bonds and two π bonds Seven sigma bonds and one π bond Six sigma bonds and one π bond Eight sigma bonds

Calgon is the name given to (a) (b) (c) (d)

3.

07

Oxidation Reduction Electrolysis Erosion

07 0.1˚ French = ____ ˚ Clarke’s.

Q.2

2. 3. 4. 5. 6. 7.

Give IUPAC name of Neopentyl chloride _________________. __________plastic cannot be remolded. Vulcanite contains about 32% _______________. Vinegar is 6-10% aqueous solution of_______________ Main component of natural gas is___________. Nylon 6:6 is polymer of ______________________________.

(a)

Differentiate between ionic bond and covalent bond with suitable examples. Explain caustic embrittlement in boilers. Calculate the temporary hardness and permanent hardness (in ppm) of a sample of water containing : Mg(HCO3)2=7.3mg/L; Ca(HCO3)2=16.2mg/L; MgCl2=9.5mg/L; CaSO4=13.6mg/L (Atomic weights of Mg and Ca are 24 and 60 respectively)

03

(b) (c)

04 07

Q.3

(a) (b) (c)

Define alloy. What are the uses of non-ferrous alloys? Write a short note on physical properties of metal. Discuss mechanism of electrochemical corrosion.

03 04 07

Q.4

(a) (b) (c)

Give advantages of R,C.C. over plain concrete. Why curing of concrete is done? Define cement. Discuss manufacturing of Portland cement.

03 04 07

Q.5

(a)

Name five fibers made from natural sources. How they differ in their properties. Discuss properties and uses of insulators. Draw structure of natural rubber. Discuss the drawback of natural rubber and how it can be overcome.

03

(b) (c)

04 07

Q.6

(a) (b) (c)

What is “Sacrificial anode”. Write a short note on refining of petroleum by fractional distillation. Discuss benefits and dangers of biotechnology.

03 04 07

Q.7

(a) (b) (c)

Define (a) Specific gravity (b) Abrasives (c) Insulators Explain Seger cone-test and its significance. How desalination of brackish water is done by electrodialysis cell?

03 04 07

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